Encontrados 32 documentos, a visualizar página 1 de 4

Laser fototérmico e sua interacção com a retina humana

Há vários efeitos resultantes da interacção da luz laser com os tecidos biológicos que podemos classificar em 5 tipos: efeito fotoquímico, fototérmico, fotoablativo, fotoablação induzida por plasma e fotodisrupção. Estes efeitos biológicos são modelados pelas propriedades ópticas dos tecidos: reflexão, absorção e dispersão e pelas características do feixe laser, nomeadamente o seu comprimento de onda (cdo) que ...

Impact of different internal convection control strategies in a non-evacuated C...

Over the last decade the technological advances observed in solar collector materials, namely better spectrally selective absorber coatings and ultra clear glass covers, contribute to performance improvements and translate into higher operational temperature ranges with higher efficiency values. While the use of Evacuated Tube Collectors (ETCs) is becoming widespread in the thermal conversion of solar energy, n...

Gastropexia Laparoscópica em Volvo Gástrico Neonatal

Introdução: O Volvo gástrico é uma doença rara em idade pediátrica. Estão descritos casos crónicos recorrentes e agudos, mas a sua incidência real é desconhecida. Apresentamos a descrição cirúrgica de um caso de volvo gástrico crónico, recorrente, diagnosticado no período neonatal, tratado com sucesso por via laparoscópica. Caso clínico: Recém-nascido, do sexo masculino, portador de anomalia de Ebstein, com vóm...

Frequency and Stochastic Domain Models for Two Geometries of the IPS Wave Power...

Frequency-domain analysis is applied to a geometry of the original IPS buoy device concept. The analysis is particularly useful in the early development stages to establish the response of power take-off mechanism characteristic parameters to different frequencies of the wave spectrum. Optimal mechanical damping and spring coefficients are computed for some parameters restrictions. Absorbed power, capture width...

Physicochemical characterization of biomaterials commonly used in dentistry as ...

The present work focuses on the physicochemical characterization of selected mineral-based biomaterials that are frequently used in dental applications. The selected materials are commercially available as granules from different biological origins: bovine, porcine, and coralline. Natural and calcined human bone were used for comparison purposes. Besides a classical rationalization of chemical composition and c...

Normal flow-mediated vasodilatation of the brachial artery and carotid artery i...

Subclinical hypothyroidism (SHT) is a disease for which exact therapeutic approaches have not yet been established. Previous studies have suggested an association between SHT and coronary heart disease. Whether this association is related to SHT-induced changes in serum lipid levels or to endothelial dysfunction is unclear. The aim of this study was to determine endothelial function measured by the flow-mediate...

Design of a new urban wind turbine airfoil using a pressure-load inverse method

This paper presents the design methodology of a new wind turbine airfoil that achieves high performance in urban environment by increasing the maximum lift. For this purpose, an inverse method was applied to obtain a new wind turbine blade section with constant pressure-load along the chord, at the design inlet angle. In comparison with conventional blade section designs, the new airfoil has increased maximum l...

Contamination by heavy metals in aquatic trophic webs: the case of otter and re...

Apendicite Aguda - Clínica Versus Histologia

Apendicite Aguda – Clínica Versus Histologia

Introdução: A apendicite aguda continua a ser um dos principais diagnósticos nos Serviços de Cirurgia Pediátrica. A taxa de apendicectomia negativa (apendicectomia sem evidência histológica de patologia), frequentemente utilizada como índice de qualidade hospitalar, permanece alta, apesar dos esforços para a reduzir, especialmente em crianças com menos de 6 anos. Objectivos: Os objectivos primários foram: o cál...